Sick 7 month baby

Hi all. My son has fever + cough w phlegm + runny nose since Wed night. We brought him to the doctor on Fri morning. And today, Sun, his fever had subsided. Appetite is back, not as much as before but slowly increasing. The issue is today, every time after feeding, he’ll vomit the milk out. He is still energetic, and sleep well. Is this normal?